Change in hen's demeanour and behaviour

[MiddleYard Chickens]

Looking for some advice about this ISA Brown hen, about 3 years old. Has been less active in the last couple weeks, comb's fallen down and not as bright. Shares the coop with 6 other ISA Brown hens.
Diet consists of Golden Layer pellets and some veggie greens. The other hens have been acting their usual selves (bit they're about a year younger). Her butt's sometimes caked with poop, so it might be a bit watery.

Looked around for mites but haven't seen anything, but given one of those insectide dust baths a couple weeks back just in case.

Isolated her for a day or so, and reduced feed as she seemed to have a bit of a sour crop, and perked up a little bit since, though not significantly.

Just wondering if it's an age + eating too many greens, or symptoms or something else.

 

[cavemanrich]

Just wondering if it's an age

Most likely AGE.. Sexlink Chickens do not have a long lifespan. Your Isa Brown chicken is an Egg laying specialist. They lay many eggs in their short life span.
I had a Red Sexlink hen a while ago. (your Isa Brown is in that category),, She produced eggs almost to her end. Then she crossed the Rainbow Bridge.
Comfort your hen the best you can,,, and provide her regular feed, and treats as before.

WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,and

 

[MiddleYard Chickens]

Thanks so much!

Always love learning more about chickens on this forum